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Mirzam

Murzim, Beta Canis Majoris, 2 Canis Majoris

Proper NamesMirzam, Murzim
Bayer DesignationBeta Canis Majoris
Flamsteed Number2 Canis Majoris
HR (BSC)2294
HD44743
ConstellationCanis Major
Right Ascension6h 23m 28s
Declination-17° 58' 4"
Distance493 light years
151 parsecs
MagnitudeApparent: -1.4
Absolute: +1.5
Spectral ClassB1II Blue Bright Giant
Optimum VisibilityJanuary
NotesMirzam is a pulsating variable of the Beta Cephei type (indeed, an alternative name for that type is 'Beta Canis Majoris variable', from this star. It exhibits multiple layers of radial and non-radial pulsations, shifting in brightness by about 10% over a period of some six hours.

A blue star in the western regions of Canis Major, the Great Dog, and the prototype for the Beta Canis Majoris class of variable stars. Its Arabic name means 'The Herald', since it rises about twenty minutes before its rather more brilliant neighbour, Sirius.

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